How to stain interior concrete – Concrete that has never been painted can be old and boring, and does nothing for a living space. But a few layers of paint can do a lot to fix an old concrete floor. Covering concrete with a few layers of paint is an economical way to update your floors. With a little effort, you can transform the old, concrete, lifeless floor into an integral part of your interior design. Mix the trisodium phosphate cleaner with water in a bucket according to the manufacturer’s instructions. Scrub the floor with the cleaner and rinse with clean water. Let it dry…